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The Virtualdiver Project. Making Greece's Underwater Cultural applied sciences Article The VIRTUALDiver Project. Making Greece’s Underwater Cultural Heritage Accessible to the Public George Pehlivanides 1, Kostas Monastiridis 1, Alexandros Tourtas 1, Elli Karyati 1, Giotis Ioannidis 1, Konstantina Bejelou 2 , Varvara Antoniou 2 and Paraskevi Nomikou 2,* 1 Tetragon S.A., 54641 Thessaloniki, Greece; [email protected] (G.P.); [email protected] (K.M.); [email protected] (A.T.); [email protected] (E.K.); [email protected] (G.I.) 2 Department of Geology and Geoenvironment, National and Kapodistrian University of Athens, 15784 Athens, Greece; [email protected] (K.B.); [email protected] (V.A.) * Correspondence: [email protected]; Tel.: +30-2107274865 Received: 20 October 2020; Accepted: 16 November 2020; Published: 18 November 2020 Abstract: Reaching the underwater world is undoubtedly an incomparable adventure. Impressive geological structures, flourishing ecosystems, shipwrecks, and submerged landscapes lie beneath the sea surface in wait for discovery. However, this world is accessible only to those who have the chance to dive or to scientists conducting underwater research. By means of a dynamically developing sector of informatics utilizing Virtual (VR) and Augmented Reality (AR) practices, the VIRTUALDiver project intends to provide access to all the aforementioned hidden “treasures” through the creation of an innovative platform providing unique interactive experiences. More specifically, specialized guided tours in natural and virtual environments covering areas of touristic, cultural, and environmental interest. VIRTUALDiver is an experience, design and content presentation platform, a custom-made add-on environment within the Unity 3D authoring tool, offering the ability to manage multimedia content in a simplified way. No specialized programming knowledge is required, enabling the project’s interdisciplinary consortium to easily collaborate and exchange ideas. The expected result is the establishment of a successful educational and entertaining cultural product to support businesses and professionals operating in the field of culture-tourism. Above all, VIRTUALDiver aspires to become a novel form of storytelling, immersing the user into unique experiences under the waves. Keywords: virtual reality; augmented reality; underwater cultural heritage; Unity 3D 1. Introduction The underwater environment in Greece is of great scientific interest in all fields of marine research. However, it has not yet been sufficiently exploited for cultural and tourism purposes. At the same time, technological advantages in the fields of Virtual (VR) and Augmented Reality (AR) have undergone considerable development by providing technical solutions for environments that their modeling has been problematic or non-operational in the past. From medical training to gaming, these technologies provide a variety of prospects that can lead previously designed and applied schemes to new directions and help new ideas to arise and develop. Especially in the area of cultural management, creating digital narratives accessible not only to the experts but also and, most importantly, to the general public in an intriguing and scientifically accurate way is of great significance [1–6]. What makes the narration in a virtual or augmented environment special is the feeling that the user is “living” the experience, allowing the narrative to be perceived through different perspectives or characters (avatars), while the “immersion” stimulates more emotional involvement. That is why for the past decade a number of relevant projects have been running towards successful cultural implementations [7]. Appl. Sci. 2020, 10, 8172; doi:10.3390/app10228172 www.mdpi.com/journal/applsci Appl. Sci. 2020, 10, 8172 2 of 21 The Underwater Cultural Heritage (UCH)—a substantial cultural capital that lies on the seabed of the world—is an important resource that needs to be protected and valued. It also stands as a triggering factor for touristic development, concerning especially underwater archaeological sites, be they shipwrecks or submerged landscapes, highly fascinating for the public, both for the sense of mystery that surrounds them and the symbiosis between artifacts and sea life. Access to these sites is limited, as only a small percentage of people can actually dive or due to the fact that a great number of these sites are in depths beyond human reach. Digital technologies (e.g., Virtual Museums, Virtual Guides, and Virtual Reconstruction of Cultural Heritage, Augmented Reality applications) provide a unique opportunity for digital accessibility to both scholars and the general public, interested in having a broader perception of these underwater sites [8–11]. Some representative cases of applying VR and AR technologies in the promotion of UCH are shown here in order to place the framework of the VIRTUALDiver project. Project VISAS: Virtual and Augmented Exploitation of Submerged Archaeological Sites, is a collaborative research project created to improve the responsible and sustainable exploitation of underwater archaeological sites by reconstructing the underwater terrain, creating a VR system for exploring this environment, and making a virtual guide experience for mobile devices used underwater [12,13]. Researchers of the project i-MARECULTURE integrated digital technologies to promote UCH to the public [14]. They developed a VR system that allows users to experience underwater environments with high cultural value, using gamification methods to create two serious games that explained the underwater excavation methods. Additionally, in order to improve underwater cultural tourism, they developed a waterproof AR system capable of acting as a guide of specific underwater archaeological sites. Other projects with similar research focus are the Lab4Dive [15,16] and the VENUS project [17,18], both of which are scientific platforms that facilitate underwater research and, ultimately, communicate UCH to other scientists and the public. Apart from the above academic research, projects from the private sector are also worth mentioning. The Blu: Deep Rescue is a virtual underwater experience giving the participants the opportunity to swim together with sea creatures like turtles, sharks and whales [19]. The Ocean Maps company has created a series of applications for virtual diving, specially designed for divers, with scheduled routes providing additional information about the underwater terrain and sea life [20]. The Underwater Virtual Museum—Underwater Malta, is a platform that gives the opportunity to investigate shipwrecks around Malta in a Virtual Reality environment [21]. Finally, the company 360◦ Virtual Tour Co. has created the Underwater Coral Reefs in 360◦, where the user can navigate through coral reefs in Palmyra Coral Gardens using 360◦ photography technics [22]. The bibliography on such matters is growing rapidly [23–30]. In almost all of the above cases, VR “dry dive” experiences were designed using all available technological and methodological tools in order to provide an immersive cultural experience that would engage the user with as many of the stimuli of a diving visit as possible. In this context, the VIRTUALDiver project was developed as an integrated interactive platform for exploring natural (AR) and virtual (VR) environments in areas of touristic and environmental interest (e.g., unique geomorphological structures, shipwrecks, sunken harbors and parks, marine parks, NATURA areas, etc.) in order to enrich travel experience and promote specific and diverse forms of tourism. The language compatibility of the platform in its pilot version will be English. Partners from various backgrounds were engaged in this endeavor. The Faculty of Geology and Geoenvironment [31], leading this research project, is a part of the School of Sciences of the National and Kapodistrian University of Athens. The aim of all undergraduate and postgraduate programs of the Faculty is to develop an enthusiasm for the geosciences and environment, thus as to educate students on meeting scientific challenges through a learning experience provided by academic personnel with an important role in the international research forefront and a wide variety of research activities with emphasis on excellence, innovation, and interdisciplinarity. TETRAGON S.A. [32] specializes in a broad spectrum of fields, such as innovative product research and development, digital and interactive applications, audio-visual productions, methodologies, services and technologies for the documentation, showcasing, Appl. Sci. 2020, 10, 8172 3 of 21 and promotion of cultural heritage and tourism, as well as consulting, design, and construction of cultural spaces, museums, and environmental infrastructure. Up2metric P.C. [33] develops innovative custom software solutions and provides consulting engineering services in the fields of computer vision, photogrammetry, machine learning, remote sensing, and metrology. Steficon S.A. [34] is a 360◦ global full-service digital agency that manages Internet brands, consisting of a team of long-lasting professionals with fusion skills such as creative thinking and design, digital and performance marketing, development of high-end ICT web, mobile applications, and video production. All the above collaborated in order to provide a successful educational and entertaining cultural product. Significant, multi-temporal, validated knowledge, information and data from the university partner guarantee a detailed, high-resolution mapping of the underwater
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